'use strict';

function get_union(collection_a, collection_b) {
  //在这里写入代码
  return [...new Set(collection_a.concat(collection_b))];
  
}

module.exports = get_union;
// var collection_a = [10, 27, 28, 19, 5];
// var collection_b = [5, 78, 28, 19, 23];
// console.log((get_union(collection_a,collection_b)));
